WOW features a contact sensitive curor as well as benign indicators. The cursor will change to reflect attack possibilities. If your character is out of range of a target it shows you can attack but has a red circle and line through it. Left clicking on the target will bring up their level and stats so you can decided whether to attack or not. You can still mouse over other creatures while this other creature is selected. So you can fight one creature while casting a spell on another.
